I don’t think you understand what the character of Kylo Ren is supposed to be . Kylo Ren is not supposed to be a good villain yet. He is a mentally unstable kid who masquerades as someone who has power like Vader but has yet to be fully trained.
I don’t think you understand that we don’t care “what he’s supposed to be”. The character doesn’t resonate because he is poorly constructed. He’s no longer a threat. It was implied in TFA that he was a badass, I mean he stopped blaster bolts in mid air and telekinetically froze people and threw them through the air. Then suddenly he forgets he has these powers at the end of the movie and gets wasted by someone who has no training. It’s just bad storytelling.
If he were supposed to be a weak villain, he should have been made a weak villain from the start of the film. Let him get stronger and stronger in the dark side as the movie progresses, not weaker and weaker.